Coal measures superimposed gas reservoir and its exploration and development technology modes

Authors

SANG Shuxun, Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization, China University of Mining and Technology, Xuzhou 221008, China; Carbon Neutrality Institute, China University of Mining and Technology, Xuzhou 221008, China; School of Resource and Geoscience, China University of Mining and Technology, Xuzhou 221116, China; School of Low-Carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaFollow
ZHENG Sijian, Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization, China University of Mining and Technology, Xuzhou 221008, China; Carbon Neutrality Institute, China University of Mining and Technology, Xuzhou 221008, China
YI Tongsheng, Guizhou Bureau of Coal Geological Exploration, Guiyang 550008, China
ZHAO Fuping, Guizhou Bureau of Coal Geological Exploration, Guiyang 550008, China
HAN Sijie, Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization, China University of Mining and Technology, Xuzhou 221008, China; Carbon Neutrality Institute, China University of Mining and Technology, Xuzhou 221008, China
JIA Jinlong, School of Resources & Safety Engineering, Wuhan Institute of Technology, Wuhan 430073, China
ZHOU Xiaozhi, School of Resource and Geoscience, China University of Mining and Technology, Xuzhou 221116, China

Abstract

Coal measures superimposed gas reservoir is a key reservoir type of coal-measure gas in coal bearing formation. The discovery, exploration and development practice of coal measures superimposed gas reservoirs in China have opened up a new chapter for the coal-measure gas exploration. In this study, the concept, main types, development characteristics and occurrence distribution of coal measures superimposed gas reservoir are proposed and expounded. The formation prerequisite, accumulation process and reservoir forming mechanism of coal measure superimposed gas reservoir are analyzed. Specifically, the geological suitability exploration and development technology modes of two typical coal measures superimposed gas reservoirs are emphatically discussed, and the application of coal measure superimposed gas reservoir exploration and exploitation technologies in coal-measure gas reservoirs is prospected. At present, three types of coal measure superimposed gas reservoirs have been found in China, which are: (distributary) channel sandstone-coal syntagmatic relation type, developed in the Shanxi Formation of north China (denoted as the North China type); coal-sandstone-mudstone interbedding type, developed in the Longtan Formation of south China (denoted as the South China type); coal-sandstone-mudstone interbedded conglomerate type, developed in the Chenghe Formation of northeast China (denoted as the Northeast China type). As a crucial controlling geological factor, sedimentary microfacies combination of mire, distributary channel and interdistributary bay in delta depositional system is favorable to form the coal measure superimposed gas reservoir. The superimposed composite reservoir structure and lithologic trap are the important characteristics of coal measure superimposed gas reservoir and the unified gas-bearing system and pressure gradient account for its essential characteristics. Furthermore, the critical formation mechanism of coal measure superimposed gas reservoir involves the transfer and balance of matter and energy among coal seams, sandstones, and shales, the migration and phase transformation among coalbed methane, tight sandstone gas, and shale gas. Himalayan orogeny is the key period for the coal measure superimposed gas reservoir formation in Shanxi formation in north China. On a technical level, high-resolution seismic lithofacies interpretation for gas reservoir identification and virtual gas-producing bedding development have been proven to be powerful means in the exploration and development of North China type coal measure superimposed gas reservoirs. Techniques such as interval optimization, small-layer perforation, staged fracturing, ball-drop pressure separation and combined layer drainage corporately contribute to the adaptive development of Longtan Formation coal measures superimposed reservoir in south China. These technical modes have made breakthroughs in the co-exploration and co-production of coal measures gas, and predictably, they will continually provide strong backing for the high efficiency development of deep buried coalbed methane in China.

Keywords

coal measure superimposed gas reservoir, exploration and development technology mode, coal-measure gas, formation mechanism, application

DOI

10.12363/issn.1001-1986.22.02.0109

Recommended Citation

SANG Shuxun, ZHENG Sijian, YI Tongsheng, et al. (2022) "Coal measures superimposed gas reservoir and its exploration and development technology modes," Coal Geology & Exploration: Vol. 50: Iss. 9, Article 3.
DOI: 10.12363/issn.1001-1986.22.02.0109
Available at: https://cge.researchcommons.org/journal/vol50/iss9/3

Reference

[1] 欧阳永林,田文广,孙斌,等. 中国煤系气成藏特征及勘探对策[J]. 天然气工业,2018,38(3):15−23

OUYANG Yonglin,TIAN Wenguang,SUN Bin,et al. Characteristics of coal measure gas accumulation and such gas exploration strategies in China[J]. Natural Gas Industry,2018,38(3):15−23

[2] RICE D D,FLORES R M. Controls on bacterial gas accumulations in thick tertiary coal beds and adjacent channel sandstones,Powder River Basin,Wyoming and Montana[J]. AAPG Bulletin(American Association of Petroleum Geologists),1991,75(3):661.

[3] JOHNSON R C,FLORES R M. Developmental geology of coalbed methane from shallow to deep in rocky mountain basins and in cook Inlet–Matanuska Basin,Alaska,USA and Canada[J]. International Journal of Coal Geology,1998,35(1):241−282.

[4] 秦勇,宋全友,傅雪海. 煤层气与常规油气共采可行性探讨:深部煤储层平衡水条件下的吸附效应[J]. 天然气地球科学,2005,16(4):492−498

QIN Yong,SONG Quanyou,FU Xuehai. Discussion on reliability for co–mining the coalbed gas and normal petroleum and natural gas:Absorptive effect of deep coal reservoir under condition of balanced water[J]. Natural Gas Geoscience,2005,16(4):492−498

[5] 曹代勇,刘亢,刘金城,等. 鄂尔多斯盆地西缘煤系非常规气共生组合特征[J]. 煤炭学报,2016,41(2):277−285

CAO Daiyong,LIU Kang,LIU Jincheng,et al. Combination characteristics of unconventional gas in coal measure in the west margin of Ordos Basin[J]. Journal of China Coal Society,2016,41(2):277−285

[6] 傅雪海,德勒恰提·加娜塔依,朱炎铭,等. 煤系非常规天然气资源特征及分隔合采技术[J]. 地学前缘,2016,23(3):36−40

FU Xuehai,DELEQIATI JIANATAYI,ZHU Yanming,et al. Resources characteristics and separated reservoirs’ drainage of unconventional gas in coal measures[J]. Earth Science Frontiers,2016,23(3):36−40

[7] 桑树勋,周效志,刘世奇,等. 岩石力学地层理论方法及其煤系气高效勘探开发应用基础述评[J]. 地质学报,2022,96(1):304−316

SANG Shuxun,ZHOU Xiaozhi,LIU Shiqi,et al. A review of mechanical stratigraphy methodology and its application in high−efficient exploration and development of coal measure gas[J]. Acta Geologica Sinica,2022,96(1):304−316

[8] 黄华州,桑树勋,毕彩芹,等. 煤层群煤系多套含气系统特征及其合采效果:以铁法盆地阜新组为例[J]. 沉积学报,2021,39(3):645−655

HUANG Huazhou,SANG Shuxun,BI Caiqin,et al. Characteristics of multi−gas−bearing systems within coal seam groups and the effect of commingled production:A case study on Fuxin Formation,Cretaceous,Tiefa Basin[J]. Acta Sedimentologica Sinica,2021,39(3):645−655

[9] 韩思杰,桑树勋,刘伟. 济阳坳陷石炭–二叠系致密砂岩气形成条件与成藏模式[J]. 石油天然气学报,2014,36(10):50−54

HAN Sijie,SANG Shuxun,LIU Wei. Accumulation conditions and accumulation pattern of tight sandstone gas in the Carboniferous and Permian of Jiyang Depression[J]. Journal of Oil and Gas Technology,2014,36(10):50−54

[10] 韩思杰. 济阳坳陷C–P煤系叠合型气藏成藏动力学过程及有利区预测[D]. 徐州：中国矿业大学，2016.

HAN Sijie. Formation kinetic processes of the superposed reservoir and its favorable area prediction of C–P coal measures in Jiyang Depression[D]. Xuzhou：China University of Mining and Technology，2016.

[11] 周培明. 济阳坳陷C–P煤系原生气藏成藏机理研究[D]. 徐州：中国矿业大学，2015.

ZHOU Peiming. Research on forming mechanism of the primary gas reserviors of the C−P coal−bearing sequence in Jiyang Depression[D]. Xuzhou：China University of Mining and Technology，2015.

[12] SANG Shuxun，HAN Sijie，LIANG Jingjing. Carboniferous–Permian coal measure superimposed reservoir (CMSR) and their implication to deep coal measure gas co–exploration and co–extraction in Jiyang Depression，north China[M]. Beijing：Geological Publishing House，2017.

[13] WIMMERS K,KOEHRER B. Integration of sedimentology,petrophysics and rock typing as key to understanding a tight gas reservoir[J]. Oil Gas European Magazine,2014,40(4):196−200.

[14] JIA Jinlong,CAO Liwen,SANG Shuxun,et al. A case study on the effective stimulation techniques practiced in the superposed gas reservoirs of coal−bearing series with multiple thin coal seams in Guizhou,China[J]. Journal of Petroleum Science and Engineering,2016,146:489−504.

[15] 秦勇,申建,沈玉林. 叠置含气系统共采兼容性:煤系“三气”及深部煤层气开采中的共性地质问题[J]. 煤炭学报,2016,41(1):14−23

QIN Yong,SHEN Jian,SHEN Yulin. Joint mining compatibility of superposed gas–bearing systems:A general geological problem for extraction of three natural gases and deep CBM in coal series[J]. Journal of China Coal Society,2016,41(1):14−23

[16] 沈玉林,秦勇,申建,等. 鄂尔多斯盆地东缘上古生界煤系叠置含气系统发育的沉积控制机理[J]. 天然气工业,2017,37(11):29−35

SHEN Yulin,QIN Yong,SHEN Jian,et al. Sedimentary control mechanism of the superimposed gas bearing system development in the Upper Palaeozoic coal measures along the eastern margin of the Ordos Basin[J]. Natural Gas Industry,2017,37(11):29−35

[17] 桑树勋,陈世悦,刘焕杰. 华北晚古生代成煤环境与成煤模式多样性研究[J]. 地质科学,2001,36(2):212−221

SANG Shuxun,CHEN Shiyue,LIU Huanjie. Study on diversity of Late Paleozoic coal–forming environments and models in North China[J]. Chinese Journal of Geology,2001,36(2):212−221

[18] HUANG Shipeng,LIAO Fengrong,WU Xiaoqi. Geochemical characteristics of Carboniferous–Permian coal–formed gas in Bohai Bay Basin[J]. Energy,Exploration & Exploitation,2010,28(1):13−24.

[19] 韩思杰，桑树勋，梁晶晶. 济阳坳陷山西组煤系叠合型气藏相控模式与勘探前景[C]//全国煤层气学术研讨会论文集. 北京：石油工业出版社，2018.

[20] 刘金,刘玉亮,陈红汉,等. 临南地区煤型气成藏主控条件分析[J]. 油气地质与采收率,2002,9(4):38−41

LIU Jin,LIU Yuliang,CHEN Honghan,et al. Analysis on master control conditions for coal related gas reservoir forming in Linnan area[J]. Petroleum Geology and Recovery Efficiency,2002,9(4):38−41

[21] HAN Sijie,SANG Shuxun,ZHOU Peiming,et al. The evolutionary history of methane adsorption capacity with reference to deep Carboniferous−Permian coal seams in the Jiyang sub−basin:Combined implementation of basin modeling and adsorption isotherm experiments[J]. Journal of Petroleum Science and Engineering,2017,158:634−646.

[22] AGHIGHI M A,RAHMAN S S. Horizontal permeability anisotropy:Effect upon the evaluation and design of primary and secondary hydraulic fracture treatments in tight gas reservoirs[J]. Journal of Petroleum Science and Engineering,2010,74(1/2):4−13.

[23] HEO W,LEE W,LEE D S. Hydraulic fracturing design for coalbed methane in Barito Basin,Indonesia[J]. Geosystem Engineering,2015,18(3):151−162.